<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="root"></div>
</body>

</html>
<script src="https://unpkg.com/vue@next"></script>
<script>
    // 对数据做校验的插件
    const app = Vue.createApp({
        template: `
        <div @click="handleClick">{{name}}</div>
        `,
        methods: {
            test() {
                console.log(this.$options.setup());
            }
        },
        mounted() {
            this.test();
        },
        // created 实例被完全初始化之前
        setup(props, context) {
            return {
                name: 'dell',
                handleClick: () => {
                    alert(123);
                }
            }
        }
    })
    const vm = app.mount('#root')
</script>